This film, despite bearing a 1963 copyright date, was actually released five years later in 1968. The original theatrical version of the film, The Madmen of Mandoras (1963), was combined with new footage of "CID" agents Vic and Toni shot entirely for the new version of the film, which was released to television and retitled "They Saved Hitler's Brain". The Vic and Toni footage was obviously shot five years later, because the hairstyles and fashions seen in them did not become popular until the late 1960s.
Despite claiming a 1968 copyright date, the tail lights on the Volkswagen Beetle that Toni is driving in the film did not come into use until 1973. This fact supports other commentators' claims that suggest a 1970s date for the added footage.
In their book *The Golden Turkey Awards*, Harry and Michael Medved awarded this film the #1 spot in the category Most Brainless Brain Movie.
There is a scene in Mandoras where a small airplane circles and then lands in order to drop off an Army general. The tail number (registration number) is visible in one of the scenes (N4328C). Upon researching it, that airplane, a 1955 Aeronca Champ 7EC, is still flying as of 5/13 and is based in Modesto, CA. However, also as of 5/13, it is for sale.